Raise code coverage from 67.9% to 75.7%

[drompincen]

Summary

• Closed-loop coverage campaign: 2 iterations, 199 new tests (386 → 585)
• Instruction coverage: 67.9% → 75.7% (target was 75%)
• Branch coverage: 61.8% → 66.7%

Iteration 1 (67.9% → 72.3%)

• ReladomoService: 56% → 100% (22 new tests — edge cases, idempotent re-store, config storage)
• ReladomoConfigParser: 20% → 99.6% (21 new tests — XML parsing, connection managers, cache config)
• SearchService: 21 new integration tests (exact/semantic/hybrid/HNSW paths)
• CoChange + GitBlame: 11 new DB-backed and parse edge case tests
• Ingestion + TextExtractor + Session: 30 new tests covering error paths, Office formats, search

Iteration 2 (72.3% → 75.7%)

• IngestionWorker: 76% → 89% (15 new tests — poll logic, Reladomo branches, error recovery)
• TextExtractor: 79% → 94% (16 new tests — POI Office formats, ZIP/EML/RTF edges)
• CoChangeService: 59% → 85% (15 new tests — filter extraction, end-to-end pipeline)
• GitBlame: live git tests + parse edge cases
• RestController: 9 new tests (session decisions, related, blame endpoints)
• SessionTranscriptParser: 14 new tests (content block variants, role fallbacks)
• ReladomoXmlParser: 13 new tests (temporal types, relationships, indices)

Test plan

• 585 tests passing, 0 failures, 4 skipped
• mvn verify green with JaCoCo report
• Only 1 production code change (CoChangeService: extract method for testability)

🤖 Generated with Claude Code